例句與造句

1. (2 ) in the original system because of the area between the piston and the piston pole is too small, the system pressure will rise when in the return stroke . and the reliever valve will open . the return velocity will reduce
   (2)原設(shè)計中，由于活塞和活塞桿的面積差很小，回程上行時，系統(tǒng)壓力會迅速升高造成溢流閥的溢流而使回程速度降低，從而降低了系統(tǒng)的工作效率。
2. It's difficult to find return velocity in a sentence. 用return velocity造句挺難的